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The Collaborative International Dictionary
rhein

Chrysophanic \Chrys`o*phan"ic\, a. Pertaining to, or derived from, or resembling, chrysophane.

Chrysophanic acid (Chem.), a yellow crystalline substance extracted from rhubarb, yellow dock, sienna, chrysarobin, etc., and shown to be a derivative of an anthracene. It is used in the treatment of skin diseases; -- called also rhein, rheic acid, rhubarbarin, etc.

Wiktionary
rhein

n. (context organic compound English) An anthraquinone found in rhubarb.

Wikipedia
Rhein

Rhein may refer to

  • Rhein (molecule), a substance in the anthraquinone group found in rhubarb
  • Eduard Rhein (1900–1993), a German inventor, publisher and author
  • Ralph Rhein (born 1965), a Swiss slalom canoer
  • Rhein Fire, a defunct professional American football team in NFL Europe
Rhein (molecule)

Rhein, also known as cassic acid, is a substance in the anthraquinone group obtained from rhubarb. Like all such substances, rhein is a cathartic. Rhein is commonly found as a glycoside such as rhein-8-glucoside or glucorhein. Rhein was first isolated in 1895. It is found in rhubarb species like Rheum undulatum and Rheum palmatum as well as in Cassia reticulata.

Originally the rhubarb plant which contains rhein was used as a laxative. It was believed that rhein along with other anthraquinone glycosides imparted this activity.

Rhein has been reevaluated as an antibacterial agent against Staphylococcus aureus in 2008. Synergy or partial synergy has been demonstrated between rhein and the antibiotics oxacillin and ampicillin.

The pharmacokinetics of rhein have not been intensively studied in humans, but at least one study in healthy male volunteers found that rhein was better absorbed from oral administration of rhubarb than from a retention enema. Rhein (at an oral dose of 50 mg twice per day) was shown to be safe when administered for five days to elderly patients with chronic congestive heart failure.

Usage examples of "rhein".

Finally, we demand and expect that full reparations be paid to the government of the Soviet Union, and to the families of those so callously murdered by the revanchist German nationalists who hide in their city on the west bank of the Rhein.

And a third chatter added that in the seventies the former Nazi propaganda expert ran a discreet donation-laundering operation for the Free Democrats, in Neuwied am Rhein.

The surviving AWACS was back at altitude now, eighty miles behind the Rhein, and its radar operators were working to reestablish control of the air battle over central Germany as the MiGs ran for home through a cloud of NATO surface-to-air missiles.